Round Ring

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1.	圆环电机专业英语 - 豆丁网 ... 轴套，套筒 shaft bushing 衬环，圆环 Lining ring,round ring 环键 Ring key ... www.docin.com\|基于2个网页

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全部全部,圆环圆环

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The surface of the body is provided with a plurality of concentric round ring areas and the thickness of each round ring area is different ;